Holiday Biomes?

When Christmas comes along, I would like it if Arctic biomes changed into Christmas biomes! A biome that contains many Santa's Workshops (A special dungeon, without enemies and more rewards, but you have to find the hidden loot), Christmas trees (chance of presents under them), Chirstmas-related quests, and flying reindeer!

When it's Halloween, it would be pretty cool if Hell biomes turned into Halloween biomes! A spooky biome that includes tons of Halloween Pumpkins skattered around, scary mansions as dungeons, and ghouls and monsters lurking around.

Maybe for the "Christmas" biomes, there could be groups of presents scattered around that give low-rarity loot, like blues or +1 accesories, and a very SUPER rare chance of something like a diamond, +2/3 accesory, etc. That'd be fun.